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Patent:US2666574


Patent:US 2666574
Title:Calculating machine having true negative totals mechanism
Date:19.01.1954
Place:Ithaca, NY und Dayton
Country:USA
Person:Carl H. Carlson Nelson R. Frieberg Oscar F. Larsen
Company:NCR (P)
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Keywords:
Link to the patent office:
(without guarantee)
 US2666574 (espacenet),  US2666574 (uspto)


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